In Robinson v The Post Office [1974] 2 All ER 737 the plaintiff was injured through the defendant’s negligence and was given an anti-tetanus injection, to which he proved allergic. This did not break the chain of causation as it was not regarded as ‘palpably wrong’ (and would not have been necessary had it not been for the defendant’s negligence in the first place). Moreover the negligent administration of the anti-tetanus injection was not a ‘but for’ cause of the claimant’s injury (since it would still have been administered even if the doctor had done an allergy test first) so it could not break the chain of causation.